MEASUREMENT RANGE: Temperature range: -50 to 70 °C; Temperature deviation: ±2 °C. Humidity range: 10% to 99% RH; Humidity deviation: ±5% RH. MINI AND SIMPLE DESIGN: With its miniature body and square shape, the device can be discreetly placed anywhere. Its simple appearance and highly practical function make it ideal for home use. No operation is required for easy screen reading. WIDE RANGE OF USE: You can use it in the home, office, car, school, hotel, laboratory, nursery, aquaculture, instrument workshop, library, factory, greenhouse, basement, garage, shed, 3D printer filament cabinet, and air-conditioned rooms, etc. INDOOR HUMIDITY MONITORING: Helps you measure indoor humidity and temperature over time, adjust humidifiers, dehumidifiers, and hygrostat systems, perfect for monitoring family living conditions and health by preventing colds, dry skin, asthma, and mold. WHAT YOU GET: One digital hygrometer thermometer* per room. Two AG13 button batteries are included in the device. Replace the battery when the display turns off.